Hello Jane,
I have checked a simple Assembly model with 2 Components made in SolidWorks 2017.
Importing Assembly is working but no 3D model is visible in the 3D View.
in Creo View when opening the pvz file generated in the Project folder, %USER%\Documents\VuforiaStudio\Projects\"My test project name"\src\phone\resources\Uploaded
No 3D data is visible also.
I don't have this problem when importing sldpart files.
In the log of Vuforia Studio, I have an error reported when importing the SLDASM file.
sw2pvdirect Error:1: Failed to get model handle for [rect-1] [D:\Temp\rect.SLDPRT]sw2pvdirect Error:1: Failed to get model handle for [rond-1] [D:\Temp\rond.SLDPRT]COMPLETE
Do you have a similar error message reported in your use case ?
By the way, an Assembly file doesn't have geometry.
It just contains positions of Parts.
Parts have geometries.
The workarounds that I am seeing are :
1) Create a shinkwrap of the Assembly file into a new Part file.
More details here :
https://forum.solidworks.com/thread/211676
2) Try to convert manually CAO Shell Tool provided in Vuforia Studio.
But I guess, we will have the same results.
Try to change the recipe settings file can be paintfull.
So, this is why I don't recommand this way.
3) Try in another third party format.
In Solidworks, export in stl or iges file format and import into Vuforia Studio.
Cheers,
Samuel